Whats goin on guys?? Have any of you ever used a chevy head # 14101083?? Im trying to figure out if they are worth using. I have had them sittin in the basement for a while now and if I were to use them it would be on a pretty much stock engine but only if they are worth using. Does anyone know the flow specs on these. Im wanting to know if these could make some decent numbers. There are tons of engine ID sites but I never can find info I need. Any help is much appreciated..

I know that these heads are 64cc but all those engine ID websites don't give any other info. The only other thing I have read was that they came on early 90's 350 HP crate engines but don't know if that's true. Does any one know how the intake and exhaust runners flow? Like I said I don't want to get rid of them if I can use them to make a good 350 HP street engine someday. Hopefully someone who have used them will know. Thanks guys

Those heads you speak of were probably one of the better heads in the 1980s before the Vortec head was introduced. Although not aluminum they were the cast iron version of the L98 head. They are real similar to the 217 head which was used on a marine application and a crate motor as well. Xtremefi is using those heads building 355 TBI engines. They are claiming they are making about 317-320 hp with them with a roller cam with like 209 duration@.050 and .455 lift. I don't have flow data on them but I can tell you they will definitely outflow the factory TBI heads easily and really make for a way better upgrade on a TBI application.

looks like these heads flow around 200 cfm or a little less. You wont be building any 400 plus horse power engines with these heads. If you are building a stock engine then stock heads perform as they are supposed to perform

Whats goin on guys?? Have any of you ever used a chevy head # 14101083?? Im trying to figure out if they are worth using. I have had them sittin in the basement for a while now and if I were to use them it would be on a pretty much stock engine but only if they are worth using. Does anyone know the flow specs on these. Im wanting to know if these could make some decent numbers. There are tons of engine ID sites but I never can find info I need. Any help is much appreciated..

Thanks

This is the cast iron version of the Corvette/Z28, aluminum L98 head, you need to check the angle of the center intake bolts as this casting makes 2 part numbers one with the center bolts at 90 degrees to the mating surface for 1986 and earlier intakes it is P/N 10159552; the other is PN/10125377 for 1987 and newer intakes with the 72 degree angle between the bolts and mounting face. It is a decent head it is especially useful as a performance replacement for trucks that have TBI and Swirl Port heads as it is essentially the same as the SP head without the vane where the owner/builder doesn't want to go to Vortec heads with the attentive intake manifold exchange the Votec heads need.

These are a substantinal improvement over older the large chamber factory smog heads as well. Not as good as Vortecs and similar aftermarket heads , but not too trashy either.

These have been sittin in the basement and I just wanted to know if they were useful. I do not plan on using these on a big project build. Simply a stock to very very mild build in the future. Maybe practice some porting. I did find some info on guys who have ported these and got better flow numbers than vortecs but that is alot of time and dedication and I dont know how much material I can take out.

Whats goin on guys?? Have any of you ever used a chevy head # 14101083?? Im trying to figure out if they are worth using. I have had them sittin in the basement for a while now and if I were to use them it would be on a pretty much stock engine but only if they are worth using. Does anyone know the flow specs on these. Im wanting to know if these could make some decent numbers. There are tons of engine ID sites but I never can find info I need. Any help is much appreciated..

Thanks

GMPP says:

Quote:

P/n 10125377 SBC Cast Iron L98 Center Bolt Valve Cover Head.
This is a cast iron cylinder head assembly used on 285 hp 350 engine (P/N 12353641). This complete cylinder head assembly includes 1.94” intake valves, 1.50” exhaust valves, valve springs (P/N 3901068) and valve spring caps (P/N 14003978).
Technical Notes: This cylinder head has 64cc chambers. The cast number for this head is 14101083 or 14096217. This cylinder head has 1987 and later inlet manifold bolt pattern. The center two bolts are at a 72° angle.

These have been sittin in the basement and I just wanted to know if they were useful. I do not plan on using these on a big project build. Simply a stock to very very mild build in the future. Maybe practice some porting. I did find some info on guys who have ported these and got better flow numbers than vortecs but that is alot of time and dedication and I dont know how much material I can take out.

Thanks guys.

I would think they are good for 300 plus hp and should support the 350. L98 heads are good for 350 plus. But it does not support more than .450 lift and is also not a good fit for most aftermarket springs.

But to answer your question yes keep them and use them for near stock rebuild should be no problem. Actually should work pretty good for truck or other high tq application.

Ill port them myself. Now I have practiced porting on heads for endless hours but what I still dont get is how Im supposed to tell if I made all the runners the same. I mean its very possible that by doing it myself that when Im done none of them will be the same. Does it matter if one flows just a little differently than others and so on?????

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